<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 - 页面未找到</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
            background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
            color: #1f2937;
        }

        .container {
            text-align: center;
            padding: 40px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            max-width: 600px;
            width: 90%;
            position: relative;
            z-index: 1;
        }

        h1 {
            font-size: 6rem;
            font-weight: 800;
            color: #1e40af;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
            animation: bounce 1s ease-in-out;
        }

        p {
            font-size: 1.25rem;
            color: #374151;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: linear-gradient(45deg, #3b82f6, #2563eb);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            transition: transform 0.2s, box-shadow 0.3s, background 0.3s;
        }

        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
            background: linear-gradient(45deg, #60a5fa, #3b82f6);
        }

        /* 背景动画效果 */
        .background-shapes {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            overflow: hidden;
        }

        .shape {
            position: absolute;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            animation: float 15s infinite ease-in-out;
        }

        .shape:nth-child(1) {
            width: 150px;
            height: 150px;
            top: 10%;
            left: 15%;
            animation-delay: 0s;
        }

        .shape:nth-child(2) {
            width: 200px;
            height: 200px;
            top: 60%;
            left: 70%;
            animation-delay: 3s;
        }

        .shape:nth-child(3) {
            width: 100px;
            height: 100px;
            top: 40%;
            left: 30%;
            animation-delay: 6s;
        }

        /* 动画 */
        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% {
                transform: translateY(0);
            }
            40% {
                transform: translateY(-30px);
            }
            60% {
                transform: translateY(-15px);
            }
        }

        @keyframes float {
            0% {
                transform: translateY(0) translateX(0);
                opacity: 0.6;
            }
            50% {
                transform: translateY(-100px) translateX(50px);
                opacity: 0.3;
            }
            100% {
                transform: translateY(0) translateX(0);
                opacity: 0.6;
            }
        }

        /* 响应式设计 */
        @media (max-width: 600px) {
            h1 {
                font-size: 4rem;
            }
            p {
                font-size: 1rem;
            }
            .container {
                padding: 20px;
            }
        }
    </style>
</head>
<body>
    <div class="background-shapes">
        <div class="shape"></div>
        <div class="shape"></div>
        <div class="shape"></div>
    </div>
    <div class="container">
        <h1>404</h1>
        <p>抱歉，我们找不到您要访问的页面。<br>可能是地址输入错误，或者页面已被移除。</p>
    </div>
</body>
</html>